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BSA R-10 Mk 4


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I don't know the calibre, but it's either 177 or 22, however, a closer look at the title makes one realise I'm up against it. Oppo has asked for help with the rifle which I've not seen. Does anyone happen to know if any of the Rifle Mark Numbers is designed to take a filling probe with just one 'O' ring on the shaft?


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